We do not sell personal information or share it for targeted advertising, so there is nothing to opt out of in that sense. These are the choices you do have.
Analytics
Turn on Global Privacy Control in your browser (built into Firefox, Brave and DuckDuckGo, and available as an extension for others) and the site does not load Google Analytics at all. Blocking cookies or using a content blocker has the same effect. Nothing else on the site depends on analytics.
Newsletter
Every newsletter email has a one-click unsubscribe link. After you unsubscribe your address is kept only on a suppression list so you are not emailed again.
Access, correction and deletion
Use the contact form and choose "A privacy request". The privacy policy explains what we hold and how requests are handled.